After quite a lot of time invested to make my gateways send out pings I got it to work… Sort of.
When I configure the ping frequency to 868100000 (which is part of my normal band), the pings are never sent out. When set to 867100000 it works. The RSSI is very low although the distance between the two gateways is about 1 meter.

In the tab “live lorawan frames” I can see “proprietary” packets being received.
When I click “gateway discovery” tab, a blank screen appears.
The log:

I’ve had something similar happen to me. When I’d attempt to use discovery I found that at times the discovery link on my second gateway will cause what seems like a lora app server “crash”. It only reloads if I manually type in a link other than the gateway discovery link that caused the “crash”.

I still haven’t gotten the discovery to work appropriately but I think that it is due to the fact that my gateways used different lora protocol versions. Version 1 and version 2…this is my theory. I can see some packets leave at the appropriate data rate and frequency but I never get discovery data.